AirHint found the following cheapest return flights from San Francisco (SFO) to St. Thomas (STT) in December 2025 (see full year).
Return flights
| 17 Dec - 25 Dec | Frontier Airlines | ||
| 05 Dec - 08 Dec | Delta | ||
| 15 Dec - 17 Dec | United | ||
| 16 Dec - 17 Dec | United | ||
| 23 Dec - 02 Jan | Frontier Airlines | ||
| 26 Dec - 04 Jan | Sun Country Airlines |
Also check the deals for one-way flights from San Francisco to St. Thomas in December.
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